In the tenth book of the Alien Next Door series, Harris, Roxy, and Zeke finally return to Earth, and decide to show Zeke one last human custom before he has to leave . . . forever! At long last, Harris, Zeke, and Roxy have finally made it back to Earth. Harris and Roxy are glad to be back, but are also sad since now their time with Zeke is over, as he has to go home to Tragas. However, as Zeke's parents have to recharge their ship before they leave, there is just enough time left for Zeke to learn about one least human tradition—the sleepover!